/*
 * WPA Supplicant - Scanning
 * Copyright (c) 2003-2014, Jouni Malinen <j@w1.fi>
 *
 * This software may be distributed under the terms of the BSD license.
 * See README for more details.
 */

#include "utils/includes.h"

#include "utils/common.h"
#include "utils/eloop.h"
#include "common/ieee802_11_defs.h"
#include "common/wpa_ctrl.h"
#include "config.h"
#include "wpa_supplicant_i.h"
#include "driver_i.h"
#include "wps_supplicant.h"
#include "p2p_supplicant.h"
#include "p2p/p2p.h"
#include "hs20_supplicant.h"
#include "notify.h"
#include "bss.h"
#include "scan.h"
#include "mesh.h"
#include "errno-base.h"

#include "include.h"
#include "uart_pub.h"
#include "param_config.h"
#include "mcu_ps_pub.h"

static void wpa_supplicant_gen_assoc_event(struct wpa_supplicant *wpa_s)
{
    struct wpa_ssid *ssid;
    union wpa_event_data data;

    ssid = wpa_supplicant_get_ssid(wpa_s);
    if (ssid == NULL)
        return;

    if (wpa_s->current_ssid == NULL) {
        wpa_s->current_ssid = ssid;
        if (wpa_s->current_ssid != NULL)
            wpas_notify_network_changed(wpa_s);
    }
    wpa_supplicant_initiate_eapol(wpa_s);
    wpa_dbg(wpa_s, MSG_DEBUG, "Already associated with a configured "
        "network - generating associated event");
    os_memset(&data, 0, sizeof(data));
    wpa_supplicant_event_sta(wpa_s, EVENT_ASSOC, &data);
}


#ifdef CONFIG_WPS
static int wpas_wps_in_use(struct wpa_supplicant *wpa_s,
               enum wps_request_type *req_type)
{
    struct wpa_ssid *ssid;
    int wps = 0;

    for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
        if (!(ssid->key_mgmt & WPA_KEY_MGMT_WPS))
            continue;

        wps = 1;
        *req_type = wpas_wps_get_req_type(ssid);
        if (!ssid->eap.phase1)
            continue;

        if (os_strstr(ssid->eap.phase1, "pbc=1"))
            return 2;
    }

#ifdef CONFIG_P2P
    if (!wpa_s->global->p2p_disabled && wpa_s->global->p2p &&
        !wpa_s->conf->p2p_disabled) {
        wpa_s->wps->dev.p2p = 1;
        if (!wps) {
            wps = 1;
            *req_type = WPS_REQ_ENROLLEE_INFO;
        }
    }
#endif /* CONFIG_P2P */

    return wps;
}
#endif /* CONFIG_WPS */


/**
 * wpa_supplicant_enabled_networks - Check whether there are enabled networks
 * @wpa_s: Pointer to wpa_supplicant data
 * Returns: 0 if no networks are enabled, >0 if networks are enabled
 *
 * This function is used to figure out whether any networks (or Interworking
 * with enabled credentials and auto_interworking) are present in the current
 * configuration.
 */
int wpa_supplicant_enabled_networks(struct wpa_supplicant *wpa_s)
{
    struct wpa_ssid *ssid = wpa_s->conf->ssid;
    int count = 0, disabled = 0;

    if (wpa_s->p2p_mgmt)
        return 0; /* no normal network profiles on p2p_mgmt interface */

    while (ssid) {
        if (!wpas_network_disabled(wpa_s, ssid))
            count++;
        else
            disabled++;
        ssid = ssid->next;
    }
    if (wpa_s->conf->cred && wpa_s->conf->interworking &&
        wpa_s->conf->auto_interworking)
        count++;
    if (count == 0 && disabled > 0) {
        wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks (%d disabled "
            "networks)", disabled);
    }
    return count;
}


static void wpa_supplicant_assoc_try(struct wpa_supplicant *wpa_s,
                     struct wpa_ssid *ssid)
{
    while (ssid) {
        if (!wpas_network_disabled(wpa_s, ssid))
            break;
        ssid = ssid->next;
    }

    /* ap_scan=2 mode - try to associate with each SSID. */
    if (ssid == NULL) {
        wpa_dbg(wpa_s, MSG_DEBUG, "wpa_supplicant_assoc_try: Reached "
            "end of scan list - go back to beginning");
        wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
        wpa_supplicant_req_scan(wpa_s, 0, 0);
        return;
    }
    if (ssid->next) {
        /* Continue from the next SSID on the next attempt. */
        wpa_s->prev_scan_ssid = ssid;
    } else {
        /* Start from the beginning of the SSID list. */
        wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
    }
    wpa_supplicant_associate(wpa_s, NULL, ssid);
}


static void wpas_trigger_scan_cb(struct wpa_radio_work *work, int deinit)
{
    struct wpa_supplicant *wpa_s = work->wpa_s;
    struct wpa_driver_scan_params *params = work->ctx;
    int ret;

    if (deinit) {
        if (!work->started) {
            wpa_scan_free_params(params);
            return;
        }
        wpa_supplicant_notify_scanning(wpa_s, 0);
        wpas_notify_scan_done(wpa_s, 0);
        wpa_s->scan_work = NULL;
        return;
    }

    if (wpas_update_random_addr_disassoc(wpa_s) < 0) {
        wpa_msg(wpa_s, MSG_INFO,
            "Failed to assign random MAC address for a scan");
        radio_work_done(work);
        return;
    }

    wpa_supplicant_notify_scanning(wpa_s, 1);

    if (wpa_s->clear_driver_scan_cache) {
        wpa_printf(MSG_DEBUG,
               "Request driver to clear scan cache due to local BSS flush");
        params->only_new_results = 1;
    }

    os_printf("wpa_drv_scan\r\n");
    ret = wpa_drv_scan(wpa_s, params);
    wpa_scan_free_params(params);
    work->ctx = NULL;
    if (ret) {
        int retry = wpa_s->last_scan_req != MANUAL_SCAN_REQ;

        if (wpa_s->disconnected)
            retry = 0;

        wpa_supplicant_notify_scanning(wpa_s, 0);
        wpas_notify_scan_done(wpa_s, 0);
        if (wpa_s->wpa_state == WPA_SCANNING)
            wpa_supplicant_set_state(wpa_s,
                         wpa_s->scan_prev_wpa_state);
        wpa_msg(wpa_s, MSG_INFO, WPA_EVENT_SCAN_FAILED "ret=%d%s",
            ret, retry ? " retry=1" : "");
        radio_work_done(work);

        if (retry) {
            /* Restore scan_req since we will try to scan again */
            wpa_s->scan_req = wpa_s->last_scan_req;
            wpa_supplicant_req_scan(wpa_s, 1, 0);
        }
        return;
    }

    os_get_reltime(&wpa_s->scan_trigger_time);
    wpa_s->scan_runs++;
    wpa_s->normal_scans++;
    wpa_s->own_scan_requested = 1;
    wpa_s->clear_driver_scan_cache = 0;
    wpa_s->scan_work = work;
}


/**
 * wpa_supplicant_trigger_scan - Request driver to start a scan
 * @wpa_s: Pointer to wpa_supplicant data
 * @params: Scan parameters
 * Returns: 0 on success, -1 on failure
 */
int wpa_supplicant_trigger_scan(struct wpa_supplicant *wpa_s,
                struct wpa_driver_scan_params *params)
{
    struct wpa_driver_scan_params *ctx;

    if (wpa_s->scan_work) {
        wpa_dbg(wpa_s, MSG_INFO, "Reject scan trigger since one is already pending");
        return -1;
    }

    ctx = wpa_scan_clone_params(params);
    if (ctx == NULL)
        return -1;

    if (radio_add_work(wpa_s, 0, "scan", 0, wpas_trigger_scan_cb, ctx) < 0)
    {
        wpa_scan_free_params(ctx);
        return -1;
    }

    return 0;
}


static void
wpa_supplicant_delayed_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
{
    struct wpa_supplicant *wpa_s = eloop_ctx;

    wpa_dbg(wpa_s, MSG_DEBUG, "Starting delayed sched scan");

    if (wpa_supplicant_req_sched_scan(wpa_s))
        wpa_supplicant_req_scan(wpa_s, 0, 0);
}


static void
wpa_supplicant_sched_scan_timeout(void *eloop_ctx, void *timeout_ctx)
{
    struct wpa_supplicant *wpa_s = eloop_ctx;

    wpa_dbg(wpa_s, MSG_DEBUG, "Sched scan timeout - stopping it");

    wpa_s->sched_scan_timed_out = 1;
    wpa_supplicant_cancel_sched_scan(wpa_s);
}


int wpa_supplicant_start_sched_scan(struct wpa_supplicant *wpa_s,
                    struct wpa_driver_scan_params *params,
                    int interval)
{
    int ret;

    wpa_supplicant_notify_scanning(wpa_s, 1);
    ret = wpa_drv_sched_scan(wpa_s, params, interval * 1000);
    if (ret)
        wpa_supplicant_notify_scanning(wpa_s, 0);
    else
        wpa_s->sched_scanning = 1;

    return ret;
}


int wpa_supplicant_stop_sched_scan(struct wpa_supplicant *wpa_s)
{
    int ret;

    ret = wpa_drv_stop_sched_scan(wpa_s);
    if (ret) {
        wpa_dbg(wpa_s, MSG_DEBUG, "stopping sched_scan failed!");
        /* TODO: what to do if stopping fails? */
        return -1;
    }

    return ret;
}


static struct wpa_driver_scan_filter *
wpa_supplicant_build_filter_ssids(struct wpa_config *conf, size_t *num_ssids)
{
    struct wpa_driver_scan_filter *ssids;
    struct wpa_ssid *ssid;
    size_t count;

    *num_ssids = 0;
    if (!conf->filter_ssids)
        return NULL;

    for (count = 0, ssid = conf->ssid; ssid; ssid = ssid->next) {
        if (ssid->ssid && ssid->ssid_len)
            count++;
    }
    if (count == 0)
        return NULL;
    ssids = os_calloc(count, sizeof(struct wpa_driver_scan_filter));
    if (ssids == NULL)
        return NULL;

    for (ssid = conf->ssid; ssid; ssid = ssid->next) {
        if (!ssid->ssid || !ssid->ssid_len)
            continue;
        os_memcpy(ssids[*num_ssids].ssid, ssid->ssid, ssid->ssid_len);
        ssids[*num_ssids].ssid_len = ssid->ssid_len;
        (*num_ssids)++;
    }

    return ssids;
}


static void wpa_supplicant_optimize_freqs(
    struct wpa_supplicant *wpa_s, struct wpa_driver_scan_params *params)
{
#ifdef CONFIG_P2P
    if (params->freqs == NULL && wpa_s->p2p_in_provisioning &&
        wpa_s->go_params) {
        /* Optimize provisioning state scan based on GO information */
        if (wpa_s->p2p_in_provisioning < 5 &&
            wpa_s->go_params->freq > 0) {
            wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO "
                "preferred frequency %d MHz",
                wpa_s->go_params->freq);
            params->freqs = os_calloc(2, sizeof(int));
            if (params->freqs)
                params->freqs[0] = wpa_s->go_params->freq;
        } else if (wpa_s->p2p_in_provisioning < 8 &&
               wpa_s->go_params->freq_list[0]) {
            wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only common "
                "channels");
            int_array_concat(&params->freqs,
                     wpa_s->go_params->freq_list);
            if (params->freqs)
                int_array_sort_unique(params->freqs);
        }
        wpa_s->p2p_in_provisioning++;
    }

    if (params->freqs == NULL && wpa_s->p2p_in_invitation) {
        /*
         * Optimize scan based on GO information during persistent
         * group reinvocation
         */
        if (wpa_s->p2p_in_invitation < 5 &&
            wpa_s->p2p_invite_go_freq > 0) {
            wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Scan only GO preferred frequency %d MHz during invitation",
                wpa_s->p2p_invite_go_freq);
            params->freqs = os_calloc(2, sizeof(int));
            if (params->freqs)
                params->freqs[0] = wpa_s->p2p_invite_go_freq;
        }
        wpa_s->p2p_in_invitation++;
        if (wpa_s->p2p_in_invitation > 20) {
            /*
             * This should not really happen since the variable is
             * cleared on group removal, but if it does happen, make
             * sure we do not get stuck in special invitation scan
             * mode.
             */
            wpa_dbg(wpa_s, MSG_DEBUG, "P2P: Clear p2p_in_invitation");
            wpa_s->p2p_in_invitation = 0;
        }
    }
#endif /* CONFIG_P2P */

#ifdef CONFIG_WPS
    if (params->freqs == NULL && wpa_s->after_wps && wpa_s->wps_freq) {
        /*
         * Optimize post-provisioning scan based on channel used
         * during provisioning.
         */
        wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz "
            "that was used during provisioning", wpa_s->wps_freq);
        params->freqs = os_calloc(2, sizeof(int));
        if (params->freqs)
            params->freqs[0] = wpa_s->wps_freq;
        wpa_s->after_wps--;
    } else if (wpa_s->after_wps)
        wpa_s->after_wps--;

    if (params->freqs == NULL && wpa_s->known_wps_freq && wpa_s->wps_freq)
    {
        /* Optimize provisioning scan based on already known channel */
        wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Scan only frequency %u MHz",
            wpa_s->wps_freq);
        params->freqs = os_calloc(2, sizeof(int));
        if (params->freqs)
            params->freqs[0] = wpa_s->wps_freq;
        wpa_s->known_wps_freq = 0; /* only do this once */
    }
#endif /* CONFIG_WPS */
}


#ifdef CONFIG_INTERWORKING
static void wpas_add_interworking_elements(struct wpa_supplicant *wpa_s,
                       struct wpabuf *buf)
{
    wpabuf_put_u8(buf, WLAN_EID_INTERWORKING);
    wpabuf_put_u8(buf, is_zero_ether_addr(wpa_s->conf->hessid) ? 1 :
              1 + ETH_ALEN);
    wpabuf_put_u8(buf, wpa_s->conf->access_network_type);
    /* No Venue Info */
    if (!is_zero_ether_addr(wpa_s->conf->hessid))
        wpabuf_put_data(buf, wpa_s->conf->hessid, ETH_ALEN);
}
#endif /* CONFIG_INTERWORKING */


static struct wpabuf * wpa_supplicant_extra_ies(struct wpa_supplicant *wpa_s)
{
    struct wpabuf *extra_ie = NULL;
    u8 ext_capab[18];
    int ext_capab_len;
#ifdef CONFIG_WPS
    int wps = 0;
    enum wps_request_type req_type = WPS_REQ_ENROLLEE_INFO;
#endif /* CONFIG_WPS */

    ext_capab_len = wpas_build_ext_capab(wpa_s, ext_capab,
                         sizeof(ext_capab));
    if (ext_capab_len > 0 &&
        wpabuf_resize(&extra_ie, ext_capab_len) == 0)
        wpabuf_put_data(extra_ie, ext_capab, ext_capab_len);

#ifdef CONFIG_INTERWORKING
    if (wpa_s->conf->interworking &&
        wpabuf_resize(&extra_ie, 100) == 0)
        wpas_add_interworking_elements(wpa_s, extra_ie);
#endif /* CONFIG_INTERWORKING */

#ifdef CONFIG_WPS
    wps = wpas_wps_in_use(wpa_s, &req_type);

    if (wps) {
        struct wpabuf *wps_ie;
        wps_ie = wps_build_probe_req_ie(wps == 2 ? DEV_PW_PUSHBUTTON :
                        DEV_PW_DEFAULT,
                        &wpa_s->wps->dev,
                        wpa_s->wps->uuid, req_type,
                        0, NULL);
        if (wps_ie) {
            if (wpabuf_resize(&extra_ie, wpabuf_len(wps_ie)) == 0)
                wpabuf_put_buf(extra_ie, wps_ie);
            wpabuf_free(wps_ie);
        }
    }

#ifdef CONFIG_P2P
    if (wps) {
        size_t ielen = p2p_scan_ie_buf_len(wpa_s->global->p2p);
        if (wpabuf_resize(&extra_ie, ielen) == 0)
            wpas_p2p_scan_ie(wpa_s, extra_ie);
    }
#endif /* CONFIG_P2P */

    wpa_supplicant_mesh_add_scan_ie(wpa_s, &extra_ie);

#endif /* CONFIG_WPS */

#ifdef CONFIG_HS20
    if (wpa_s->conf->hs20 && wpabuf_resize(&extra_ie, 7) == 0)
        wpas_hs20_add_indication(extra_ie, -1);
#endif /* CONFIG_HS20 */

#ifdef CONFIG_FST
    if (wpa_s->fst_ies &&
        wpabuf_resize(&extra_ie, wpabuf_len(wpa_s->fst_ies)) == 0)
        wpabuf_put_buf(extra_ie, wpa_s->fst_ies);
#endif /* CONFIG_FST */

    return extra_ie;
}


#ifdef CONFIG_P2P

/*
 * Check whether there are any enabled networks or credentials that could be
 * used for a non-P2P connection.
 */
static int non_p2p_network_enabled(struct wpa_supplicant *wpa_s)
{
    struct wpa_ssid *ssid;

    for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
        if (wpas_network_disabled(wpa_s, ssid))
            continue;
        if (!ssid->p2p_group)
            return 1;
    }

    if (wpa_s->conf->cred && wpa_s->conf->interworking &&
        wpa_s->conf->auto_interworking)
        return 1;

    return 0;
}

#endif /* CONFIG_P2P */


static struct hostapd_hw_modes * get_mode(struct hostapd_hw_modes *modes,
                      u16 num_modes,
                      enum hostapd_hw_mode mode)
{
    u16 i;

    for (i = 0; i < num_modes; i++) {
        if (modes[i].mode == mode)
            return &modes[i];
    }

    return NULL;
}


static void wpa_setband_scan_freqs_list(struct wpa_supplicant *wpa_s,
                    enum hostapd_hw_mode band,
                    struct wpa_driver_scan_params *params)
{
    /* Include only supported channels for the specified band */
    struct hostapd_hw_modes *mode;
    int count, i;

    mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, band);
    if (mode == NULL) {
        /* No channels supported in this band - use empty list */
        params->freqs = os_zalloc(sizeof(int));
        return;
    }

    params->freqs = os_calloc(mode->num_channels + 1, sizeof(int));
    if (params->freqs == NULL)
        return;
    for (count = 0, i = 0; i < mode->num_channels; i++) {
        if (mode->channels[i].flag & HOSTAPD_CHAN_DISABLED)
            continue;
        params->freqs[count++] = mode->channels[i].freq;
    }
}


static void wpa_setband_scan_freqs(struct wpa_supplicant *wpa_s,
                   struct wpa_driver_scan_params *params)
{
    if (wpa_s->hw.modes == NULL)
        return; /* unknown what channels the driver supports */
    if (params->freqs)
        return; /* already using a limited channel set */
    if (wpa_s->setband == WPA_SETBAND_5G)
        wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211A,
                        params);
    else if (wpa_s->setband == WPA_SETBAND_2G)
        wpa_setband_scan_freqs_list(wpa_s, HOSTAPD_MODE_IEEE80211G,
                        params);
}


static void wpa_set_scan_ssids(struct wpa_supplicant *wpa_s,
                   struct wpa_driver_scan_params *params,
                   size_t max_ssids)
{
    unsigned int i;
    struct wpa_ssid *ssid;

    for (i = 0; i < wpa_s->scan_id_count; i++) {
        unsigned int j;

        ssid = wpa_config_get_network(wpa_s->conf, wpa_s->scan_id[i]);
        if (!ssid || !ssid->scan_ssid)
            continue;

        for (j = 0; j < params->num_ssids; j++) {
            if (params->ssids[j].ssid_len == ssid->ssid_len &&
                params->ssids[j].ssid &&
                os_memcmp(params->ssids[j].ssid, ssid->ssid,
                      ssid->ssid_len) == 0)
                break;
        }
        if (j < params->num_ssids)
            continue; /* already in the list */

        if (params->num_ssids + 1 > max_ssids) {
            wpa_printf(MSG_DEBUG,
                   "Over max scan SSIDs for manual request");
            break;
        }

        wpa_printf(MSG_DEBUG, "Scan SSID (manual request): %s",
               wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
        params->ssids[params->num_ssids].ssid = ssid->ssid;
        params->ssids[params->num_ssids].ssid_len = ssid->ssid_len;
        params->num_ssids++;
    }

    wpa_s->scan_id_count = 0;
}


static int wpa_set_ssids_from_scan_req(struct wpa_supplicant *wpa_s,
                       struct wpa_driver_scan_params *params,
                       size_t max_ssids)
{
    unsigned int i;

    if (wpa_s->ssids_from_scan_req == NULL ||
        wpa_s->num_ssids_from_scan_req == 0)
        return 0;

    if (wpa_s->num_ssids_from_scan_req > max_ssids) {
        wpa_s->num_ssids_from_scan_req = max_ssids;
        wpa_printf(MSG_DEBUG, "Over max scan SSIDs from scan req: %u",
               (unsigned int) max_ssids);
    }

    for (i = 0; i < wpa_s->num_ssids_from_scan_req; i++) {
        params->ssids[i].ssid = wpa_s->ssids_from_scan_req[i].ssid;
        params->ssids[i].ssid_len =
            wpa_s->ssids_from_scan_req[i].ssid_len;
        wpa_hexdump_ascii(MSG_DEBUG, "specific SSID",
                  params->ssids[i].ssid,
                  params->ssids[i].ssid_len);
    }

    params->num_ssids = wpa_s->num_ssids_from_scan_req;
    //wpa_s->num_ssids_from_scan_req = 0;
    return 1;
}

int is_fast_connect()
{
    if (g_sta_param_ptr)
        return g_sta_param_ptr->fast_connect_set;
    return 0;
}

static void wpa_supplicant_scan(void *eloop_ctx, void *timeout_ctx)
{
    struct wpa_supplicant *wpa_s = eloop_ctx;
    struct wpa_ssid *ssid;
    int ret, p2p_in_prog;
    struct wpabuf *extra_ie = NULL;
    struct wpa_driver_scan_params params;
    struct wpa_driver_scan_params *scan_params;
    size_t max_ssids;
    int connect_without_scan = 0;

    os_printf("wpa_supplicant_scan\r\n");
    if (wpa_s->pno || wpa_s->pno_sched_pending) {
        wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - PNO is in progress");
        return;
    }

    if (wpa_s->wpa_state == WPA_INTERFACE_DISABLED) {
        wpa_dbg(wpa_s, MSG_DEBUG, "Skip scan - interface disabled");
        return;
    }

    if (wpa_s->disconnected && wpa_s->scan_req == NORMAL_SCAN_REQ) {
        wpa_dbg(wpa_s, MSG_DEBUG, "Disconnected - do not scan");
        wpa_supplicant_set_state(wpa_s, WPA_DISCONNECTED);
        return;
    }

    if (wpa_s->scanning) {
        /*
         * If we are already in scanning state, we shall reschedule the
         * the incoming scan request.
         */
        wpa_dbg(wpa_s, MSG_DEBUG, "Already scanning - Reschedule the incoming scan req");
        wpa_supplicant_req_scan(wpa_s, 1, 0);
        return;
    }

    if (!wpa_supplicant_enabled_networks(wpa_s) &&
        wpa_s->scan_req == NORMAL_SCAN_REQ) {
        wpa_dbg(wpa_s, MSG_DEBUG, "No enabled networks - do not scan");
        wpa_supplicant_set_state(wpa_s, WPA_INACTIVE);
        return;
    }

    if (wpa_s->conf->ap_scan != 0 &&
        (wpa_s->drv_flags & WPA_DRIVER_FLAGS_WIRED)) {
        wpa_dbg(wpa_s, MSG_DEBUG, "Using wired authentication - "
            "overriding ap_scan configuration");
        wpa_s->conf->ap_scan = 0;
        wpas_notify_ap_scan_changed(wpa_s);
    }

    if (wpa_s->conf->ap_scan == 0) {
        wpa_supplicant_gen_assoc_event(wpa_s);
        return;
    }

    ssid = NULL;
    if (wpa_s->scan_req != MANUAL_SCAN_REQ &&
        wpa_s->connect_without_scan) {
        connect_without_scan = 1;
        for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
            if (ssid == wpa_s->connect_without_scan)
                break;
        }
    }
    if(g_sta_param_ptr->fast_connect_set){
        connect_without_scan = 1;
        ssid = wpa_s->conf->ssid;
    }

    p2p_in_prog = wpas_p2p_in_progress(wpa_s);
    if (p2p_in_prog && p2p_in_prog != 2 &&
        (!ssid ||
         (ssid->mode != WPAS_MODE_AP && ssid->mode != WPAS_MODE_P2P_GO))) {
        wpa_dbg(wpa_s, MSG_DEBUG, "Delay station mode scan while P2P operation is in progress");
        wpa_supplicant_req_scan(wpa_s, 5, 0);
        return;
    }

    if (wpa_s->conf->ap_scan == 2)
        max_ssids = 1;
    else {
        max_ssids = wpa_s->max_scan_ssids;
        if (max_ssids > WPAS_MAX_SCAN_SSIDS)
            max_ssids = WPAS_MAX_SCAN_SSIDS;
    }

    wpa_s->last_scan_req = wpa_s->scan_req;
    //wpa_s->scan_req = NORMAL_SCAN_REQ;

    if (connect_without_scan) {
        wpa_s->connect_without_scan = NULL;
        if (ssid) {
            wpa_printf(MSG_DEBUG, "Start a pre-selected network "
                   "without scan step");
            wpa_supplicant_associate(wpa_s, NULL, ssid);
            return;
        }
    }

    os_memset(&params, 0, sizeof(params));

    wpa_s->scan_prev_wpa_state = wpa_s->wpa_state;
    if (wpa_s->wpa_state == WPA_DISCONNECTED ||
        wpa_s->wpa_state == WPA_INACTIVE)
        wpa_supplicant_set_state(wpa_s, WPA_SCANNING);

    /*
     * If autoscan has set its own scanning parameters
     */
    if (wpa_s->autoscan_params != NULL) {
        scan_params = wpa_s->autoscan_params;
        goto scan;
    }

    if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
        wpa_set_ssids_from_scan_req(wpa_s, &params, max_ssids)) {
        wpa_printf(MSG_DEBUG, "Use specific SSIDs from SCAN command");
        goto ssid_list_set;
    }

#ifdef CONFIG_P2P
    if ((wpa_s->p2p_in_provisioning || wpa_s->show_group_started) &&
        wpa_s->go_params && !wpa_s->conf->passive_scan) {
        wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during P2P group formation (p2p_in_provisioning=%d show_group_started=%d)",
               wpa_s->p2p_in_provisioning,
               wpa_s->show_group_started);
        params.ssids[0].ssid = wpa_s->go_params->ssid;
        params.ssids[0].ssid_len = wpa_s->go_params->ssid_len;
        params.num_ssids = 1;
        goto ssid_list_set;
    }

    if (wpa_s->p2p_in_invitation) {
        if (wpa_s->current_ssid) {
            wpa_printf(MSG_DEBUG, "P2P: Use specific SSID for scan during invitation");
            params.ssids[0].ssid = wpa_s->current_ssid->ssid;
            params.ssids[0].ssid_len =
                wpa_s->current_ssid->ssid_len;
            params.num_ssids = 1;
        } else {
            wpa_printf(MSG_DEBUG, "P2P: No specific SSID known for scan during invitation");
        }
        goto ssid_list_set;
    }
#endif /* CONFIG_P2P */

    /* Find the starting point from which to continue scanning */
    ssid = wpa_s->conf->ssid;
    if (wpa_s->prev_scan_ssid != WILDCARD_SSID_SCAN) {
        while (ssid) {
            if (ssid == wpa_s->prev_scan_ssid) {
                ssid = ssid->next;
                break;
            }
            ssid = ssid->next;
        }
    }

    if (wpa_s->last_scan_req != MANUAL_SCAN_REQ &&
#ifdef CONFIG_AP
        !wpa_s->ap_iface &&
#endif /* CONFIG_AP */
        wpa_s->conf->ap_scan == 2) {
        wpa_s->connect_without_scan = NULL;
        wpa_s->prev_scan_wildcard = 0;
        wpa_supplicant_assoc_try(wpa_s, ssid);
        return;
    } else if (wpa_s->conf->ap_scan == 2) {
        /*
         * User-initiated scan request in ap_scan == 2; scan with
         * wildcard SSID.
         */
        ssid = NULL;
    } else if (wpa_s->reattach && wpa_s->current_ssid != NULL) {
        /*
         * Perform single-channel single-SSID scan for
         * reassociate-to-same-BSS operation.
         */
        /* Setup SSID */
        ssid = wpa_s->current_ssid;
        wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
                  ssid->ssid, ssid->ssid_len);
        params.ssids[0].ssid = ssid->ssid;
        params.ssids[0].ssid_len = ssid->ssid_len;
        params.num_ssids = 1;

        /*
         * Allocate memory for frequency array, allocate one extra
         * slot for the zero-terminator.
         */
        params.freqs = os_malloc(sizeof(int) * 2);
        if (params.freqs == NULL) {
            wpa_dbg(wpa_s, MSG_ERROR, "Memory allocation failed");
            return;
        }
        params.freqs[0] = wpa_s->assoc_freq;
        params.freqs[1] = 0;

        /*
         * Reset the reattach flag so that we fall back to full scan if
         * this scan fails.
         */
        wpa_s->reattach = 0;
    } else {
        struct wpa_ssid *start = ssid, *tssid;
        int freqs_set = 0;
        if (ssid == NULL && max_ssids > 1)
            ssid = wpa_s->conf->ssid;
        while (ssid) {
            if (!wpas_network_disabled(wpa_s, ssid) &&
                ssid->scan_ssid) {
                wpa_hexdump_ascii(MSG_DEBUG, "Scan SSID",
                          ssid->ssid, ssid->ssid_len);
                params.ssids[params.num_ssids].ssid =
                    ssid->ssid;
                params.ssids[params.num_ssids].ssid_len =
                    ssid->ssid_len;
                params.num_ssids++;
                if (params.num_ssids + 1 >= max_ssids)
                    break;
            }
            ssid = ssid->next;
            if (ssid == start)
                break;
            if (ssid == NULL && max_ssids > 1 &&
                start != wpa_s->conf->ssid)
                ssid = wpa_s->conf->ssid;
        }

        if (wpa_s->scan_id_count &&
            wpa_s->last_scan_req == MANUAL_SCAN_REQ)
            wpa_set_scan_ssids(wpa_s, &params, max_ssids);

        for (tssid = wpa_s->conf->ssid;
             wpa_s->last_scan_req != MANUAL_SCAN_REQ && tssid;
             tssid = tssid->next) {
            if (wpas_network_disabled(wpa_s, tssid))
                continue;
            if ((params.freqs || !freqs_set) && tssid->scan_freq) {
                int_array_concat(&params.freqs,
                         tssid->scan_freq);
            } else {
                os_free(params.freqs);
                params.freqs = NULL;
            }
            freqs_set = 1;
        }
        int_array_sort_unique(params.freqs);
    }

    if (ssid && max_ssids == 1) {
        /*
         * If the driver is limited to 1 SSID at a time interleave
         * wildcard SSID scans with specific SSID scans to avoid
         * waiting a long time for a wildcard scan.
         */
        if (!wpa_s->prev_scan_wildcard) {
            params.ssids[0].ssid = NULL;
            params.ssids[0].ssid_len = 0;
            wpa_s->prev_scan_wildcard = 1;
            wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for "
                "wildcard SSID (Interleave with specific)");
        } else {
            wpa_s->prev_scan_ssid = ssid;
            wpa_s->prev_scan_wildcard = 0;
            wpa_dbg(wpa_s, MSG_DEBUG,
                "Starting AP scan for specific SSID: %s",
                wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
        }
    } else if (ssid) {
        /* max_ssids > 1 */

        wpa_s->prev_scan_ssid = ssid;
        wpa_dbg(wpa_s, MSG_DEBUG, "Include wildcard SSID in "
            "the scan request");
        params.num_ssids++;
    } else if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
           wpa_s->manual_scan_passive && params.num_ssids == 0) {
        wpa_dbg(wpa_s, MSG_DEBUG, "Use passive scan based on manual request");
    } else if (wpa_s->conf->passive_scan) {
        wpa_dbg(wpa_s, MSG_DEBUG,
            "Use passive scan based on configuration");
    } else {
        wpa_s->prev_scan_ssid = WILDCARD_SSID_SCAN;
        params.num_ssids++;
        wpa_dbg(wpa_s, MSG_DEBUG, "Starting AP scan for wildcard "
            "SSID");
    }

ssid_list_set:
    wpa_supplicant_optimize_freqs(wpa_s, &params);
    extra_ie = wpa_supplicant_extra_ies(wpa_s);

    if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
        wpa_s->manual_scan_only_new) {
        wpa_printf(MSG_DEBUG,
               "Request driver to clear scan cache due to manual only_new=1 scan");
        params.only_new_results = 1;
    }

    if (wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs == NULL &&
        wpa_s->manual_scan_freqs) {
        wpa_dbg(wpa_s, MSG_DEBUG, "Limit manual scan to specified channels");
        params.freqs = wpa_s->manual_scan_freqs;
        wpa_s->manual_scan_freqs = NULL;
    }

    if (params.freqs == NULL && wpa_s->next_scan_freqs) {
        wpa_dbg(wpa_s, MSG_DEBUG, "Optimize scan based on previously "
            "generated frequency list");
        params.freqs = wpa_s->next_scan_freqs;
    } else
        os_free(wpa_s->next_scan_freqs);
    wpa_s->next_scan_freqs = NULL;
    wpa_setband_scan_freqs(wpa_s, &params);

    /* See if user specified frequencies. If so, scan only those. */
    if (wpa_s->conf->freq_list && !params.freqs) {
        wpa_dbg(wpa_s, MSG_DEBUG,
            "Optimize scan based on conf->freq_list");
        int_array_concat(&params.freqs, wpa_s->conf->freq_list);
    }

    /* Use current associated channel? */
    if (wpa_s->conf->scan_cur_freq && !params.freqs) {
        unsigned int num = wpa_s->num_multichan_concurrent;

        params.freqs = os_calloc(num + 1, sizeof(int));
        if (params.freqs) {
            num = get_shared_radio_freqs(wpa_s, params.freqs, num);
            if (num > 0) {
                wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the "
                    "current operating channels since "
                    "scan_cur_freq is enabled");
            } else {
                os_free(params.freqs);
                params.freqs = NULL;
            }
        }
    }

    params.filter_ssids = wpa_supplicant_build_filter_ssids(
        wpa_s->conf, &params.num_filter_ssids);
    if (extra_ie) {
        params.extra_ies = wpabuf_head(extra_ie);
        params.extra_ies_len = wpabuf_len(extra_ie);
    }

#ifdef CONFIG_P2P
    if (wpa_s->p2p_in_provisioning || wpa_s->p2p_in_invitation ||
        (wpa_s->show_group_started && wpa_s->go_params)) {
        /*
         * The interface may not yet be in P2P mode, so we have to
         * explicitly request P2P probe to disable CCK rates.
         */
        params.p2p_probe = 1;
    }
#endif /* CONFIG_P2P */

    if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCAN) {
        params.mac_addr_rand = 1;
        if (wpa_s->mac_addr_scan) {
            params.mac_addr = wpa_s->mac_addr_scan;
            params.mac_addr_mask = wpa_s->mac_addr_scan + ETH_ALEN;
        }
    }

    scan_params = &params;

scan:
#ifdef CONFIG_P2P
    /*
     * If the driver does not support multi-channel concurrency and a
     * virtual interface that shares the same radio with the wpa_s interface
     * is operating there may not be need to scan other channels apart from
     * the current operating channel on the other virtual interface. Filter
     * out other channels in case we are trying to find a connection for a
     * station interface when we are not configured to prefer station
     * connection and a concurrent operation is already in process.
     */
    if (wpa_s->scan_for_connection &&
        wpa_s->last_scan_req == NORMAL_SCAN_REQ &&
        !scan_params->freqs && !params.freqs &&
        wpas_is_p2p_prioritized(wpa_s) &&
        wpa_s->p2p_group_interface == NOT_P2P_GROUP_INTERFACE &&
        non_p2p_network_enabled(wpa_s)) {
        unsigned int num = wpa_s->num_multichan_concurrent;

        params.freqs = os_calloc(num + 1, sizeof(int));
        if (params.freqs) {
            num = get_shared_radio_freqs(wpa_s, params.freqs, num);
            if (num > 0 && num == wpa_s->num_multichan_concurrent) {
                wpa_dbg(wpa_s, MSG_DEBUG, "Scan only the current operating channels since all channels are already used");
            } else {
                os_free(params.freqs);
                params.freqs = NULL;
            }
        }
    }
#endif /* CONFIG_P2P */

    ret = wpa_supplicant_trigger_scan(wpa_s, scan_params);

    if (ret && wpa_s->last_scan_req == MANUAL_SCAN_REQ && params.freqs &&
        !wpa_s->manual_scan_freqs) {
        /* Restore manual_scan_freqs for the next attempt */
        wpa_s->manual_scan_freqs = params.freqs;
        params.freqs = NULL;
    }

    wpabuf_free(extra_ie);
    os_free(params.freqs);
    os_free(params.filter_ssids);

    if (ret) {
        wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate AP scan");
        if (wpa_s->scan_prev_wpa_state != wpa_s->wpa_state)
            wpa_supplicant_set_state(wpa_s,
                         wpa_s->scan_prev_wpa_state);
        /* Restore scan_req since we will try to scan again */
        wpa_s->scan_req = wpa_s->last_scan_req;
        wpa_supplicant_req_scan(wpa_s, 1, 0);
    } else {
        wpa_s->scan_for_connection = 0;
#ifdef CONFIG_INTERWORKING
        wpa_s->interworking_fast_assoc_tried = 0;
#endif /* CONFIG_INTERWORKING */
    }
}


void wpa_supplicant_update_scan_int(struct wpa_supplicant *wpa_s, int sec)
{
    struct os_reltime remaining, new_int;
    int cancelled;

    cancelled = eloop_cancel_timeout_one(wpa_supplicant_scan, wpa_s, NULL,
                         &remaining);

    new_int.sec = sec;
    new_int.usec = 0;
    if (cancelled && os_reltime_before(&remaining, &new_int)) {
        new_int.sec = remaining.sec;
        new_int.usec = remaining.usec;
    }

    if (cancelled) {
        eloop_register_timeout(new_int.sec, new_int.usec,
                       wpa_supplicant_scan, wpa_s, NULL);
    }
    wpa_s->scan_interval = sec;
}


/**
 * wpa_supplicant_req_scan - Schedule a scan for neighboring access points
 * @wpa_s: Pointer to wpa_supplicant data
 * @sec: Number of seconds after which to scan
 * @usec: Number of microseconds after which to scan
 *
 * This function is used to schedule a scan for neighboring access points after
 * the specified time.
 */

void wpa_supplicant_req_scan(struct wpa_supplicant *wpa_s, int sec, int usec)
{
    int res;

    os_printf("wpa_supplicant_req_scan\r\n");
    mcu_prevent_set(MCU_PS_CONNECT);

    if (wpa_s->p2p_mgmt) {
        wpa_dbg(wpa_s, MSG_DEBUG,
            "Ignore scan request (%d.%06d sec) on p2p_mgmt interface",
            sec, usec);
        return;
    }

    res = eloop_deplete_timeout(sec,
                                usec,
                                wpa_supplicant_scan,
                                wpa_s,
                                NULL);
    if (res == 1)
    {
        os_printf("Rescheduling scan request: %d.%06d sec\r\n",
                    sec, usec);
    }
    else if (res == 0)
    {
        os_printf("Ignore new scan request for %d.%06d sec since an earlier request is scheduled to trigger sooner\r\n",
                    sec, usec);
    }
    else
    {
        os_printf("Setting scan request: %d.%06d sec\r\n",
                    sec, usec);
        eloop_register_timeout(sec, usec, wpa_supplicant_scan, wpa_s, NULL);
    }
}


/**
 * wpa_supplicant_delayed_sched_scan - Request a delayed scheduled scan
 * @wpa_s: Pointer to wpa_supplicant data
 * @sec: Number of seconds after which to scan
 * @usec: Number of microseconds after which to scan
 * Returns: 0 on success or -1 otherwise
 *
 * This function is used to schedule periodic scans for neighboring
 * access points after the specified time.
 */
int wpa_supplicant_delayed_sched_scan(struct wpa_supplicant *wpa_s,
                      int sec, int usec)
{
    if (!wpa_s->sched_scan_supported)
        return -1;

    eloop_register_timeout(sec, usec,
                   wpa_supplicant_delayed_sched_scan_timeout,
                   wpa_s, NULL);

    return 0;
}


/**
 * wpa_supplicant_req_sched_scan - Start a periodic scheduled scan
 * @wpa_s: Pointer to wpa_supplicant data
 * Returns: 0 is sched_scan was started or -1 otherwise
 *
 * This function is used to schedule periodic scans for neighboring
 * access points repeating the scan continuously.
 */
int wpa_supplicant_req_sched_scan(struct wpa_supplicant *wpa_s)
{
    struct wpa_driver_scan_params params;
    struct wpa_driver_scan_params *scan_params;
    enum wpa_states prev_state;
    struct wpa_ssid *ssid = NULL;
    struct wpabuf *extra_ie = NULL;
    int ret;
    unsigned int max_sched_scan_ssids;
    int wildcard = 0;
    int need_ssids;

    if (!wpa_s->sched_scan_supported)
        return -1;

    if (wpa_s->max_sched_scan_ssids > WPAS_MAX_SCAN_SSIDS)
        max_sched_scan_ssids = WPAS_MAX_SCAN_SSIDS;
    else
        max_sched_scan_ssids = wpa_s->max_sched_scan_ssids;
    if (max_sched_scan_ssids < 1 || wpa_s->conf->disable_scan_offload)
        return -1;

    if (wpa_s->sched_scanning) {
        wpa_dbg(wpa_s, MSG_DEBUG, "Already sched scanning");
        return 0;
    }

    need_ssids = 0;
    for (ssid = wpa_s->conf->ssid; ssid; ssid = ssid->next) {
        if (!wpas_network_disabled(wpa_s, ssid) && !ssid->scan_ssid) {
            /* Use wildcard SSID to find this network */
            wildcard = 1;
        } else if (!wpas_network_disabled(wpa_s, ssid) &&
               ssid->ssid_len)
            need_ssids++;

#ifdef CONFIG_WPS
        if (!wpas_network_disabled(wpa_s, ssid) &&
            ssid->key_mgmt == WPA_KEY_MGMT_WPS) {
            /*
             * Normal scan is more reliable and faster for WPS
             * operations and since these are for short periods of
             * time, the benefit of trying to use sched_scan would
             * be limited.
             */
            wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
                "sched_scan for WPS");
            return -1;
        }
#endif /* CONFIG_WPS */
    }
    if (wildcard)
        need_ssids++;

    if (wpa_s->normal_scans < 3 &&
        (need_ssids <= wpa_s->max_scan_ssids ||
         wpa_s->max_scan_ssids >= (int) max_sched_scan_ssids)) {
        /*
         * When normal scan can speed up operations, use that for the
         * first operations before starting the sched_scan to allow
         * user space sleep more. We do this only if the normal scan
         * has functionality that is suitable for this or if the
         * sched_scan does not have better support for multiple SSIDs.
         */
        wpa_dbg(wpa_s, MSG_DEBUG, "Use normal scan instead of "
            "sched_scan for initial scans (normal_scans=%d)",
            wpa_s->normal_scans);
        return -1;
    }

    os_memset(&params, 0, sizeof(params));

    /* If we can't allocate space for the filters, we just don't filter */
    params.filter_ssids = os_calloc(wpa_s->max_match_sets,
                    sizeof(struct wpa_driver_scan_filter));

    prev_state = wpa_s->wpa_state;
    if (wpa_s->wpa_state == WPA_DISCONNECTED ||
        wpa_s->wpa_state == WPA_INACTIVE)
        wpa_supplicant_set_state(wpa_s, WPA_SCANNING);

    if (wpa_s->autoscan_params != NULL) {
        scan_params = wpa_s->autoscan_params;
        goto scan;
    }

    /* Find the starting point from which to continue scanning */
    ssid = wpa_s->conf->ssid;
    if (wpa_s->prev_sched_ssid) {
        while (ssid) {
            if (ssid == wpa_s->prev_sched_ssid) {
                ssid = ssid->next;
                break;
            }
            ssid = ssid->next;
        }
    }

    if (!ssid || !wpa_s->prev_sched_ssid) {
        wpa_dbg(wpa_s, MSG_DEBUG, "Beginning of SSID list");
        if (wpa_s->conf->sched_scan_interval)
            wpa_s->sched_scan_interval =
                wpa_s->conf->sched_scan_interval;
        if (wpa_s->sched_scan_interval == 0)
            wpa_s->sched_scan_interval = 10;
        wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
        wpa_s->first_sched_scan = 1;
        ssid = wpa_s->conf->ssid;
        wpa_s->prev_sched_ssid = ssid;
    }

    if (wildcard) {
        wpa_dbg(wpa_s, MSG_DEBUG, "Add wildcard SSID to sched_scan");
        params.num_ssids++;
    }

    while (ssid) {
        if (wpas_network_disabled(wpa_s, ssid))
            goto next;

        if (params.num_filter_ssids < wpa_s->max_match_sets &&
            params.filter_ssids && ssid->ssid && ssid->ssid_len) {
            wpa_dbg(wpa_s, MSG_DEBUG, "add to filter ssid: %s",
                wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
            os_memcpy(params.filter_ssids[params.num_filter_ssids].ssid,
                  ssid->ssid, ssid->ssid_len);
            params.filter_ssids[params.num_filter_ssids].ssid_len =
                ssid->ssid_len;
            params.num_filter_ssids++;
        } else if (params.filter_ssids && ssid->ssid && ssid->ssid_len)
        {
            wpa_dbg(wpa_s, MSG_DEBUG, "Not enough room for SSID "
                "filter for sched_scan - drop filter");
            os_free(params.filter_ssids);
            params.filter_ssids = NULL;
            params.num_filter_ssids = 0;
        }

        if (ssid->scan_ssid && ssid->ssid && ssid->ssid_len) {
            if (params.num_ssids == max_sched_scan_ssids)
                break; /* only room for broadcast SSID */
            wpa_dbg(wpa_s, MSG_DEBUG,
                "add to active scan ssid: %s",
                wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
            params.ssids[params.num_ssids].ssid =
                ssid->ssid;
            params.ssids[params.num_ssids].ssid_len =
                ssid->ssid_len;
            params.num_ssids++;
            if (params.num_ssids >= max_sched_scan_ssids) {
                wpa_s->prev_sched_ssid = ssid;
                do {
                    ssid = ssid->next;
                } while (ssid &&
                     (wpas_network_disabled(wpa_s, ssid) ||
                      !ssid->scan_ssid));
                break;
            }
        }

    next:
        wpa_s->prev_sched_ssid = ssid;
        ssid = ssid->next;
    }

    if (params.num_filter_ssids == 0) {
        os_free(params.filter_ssids);
        params.filter_ssids = NULL;
    }

    extra_ie = wpa_supplicant_extra_ies(wpa_s);
    if (extra_ie) {
        params.extra_ies = wpabuf_head(extra_ie);
        params.extra_ies_len = wpabuf_len(extra_ie);
    }

    if (wpa_s->conf->filter_rssi)
        params.filter_rssi = wpa_s->conf->filter_rssi;

    /* See if user specified frequencies. If so, scan only those. */
    if (wpa_s->conf->freq_list && !params.freqs) {
        wpa_dbg(wpa_s, MSG_DEBUG,
            "Optimize scan based on conf->freq_list");
        int_array_concat(&params.freqs, wpa_s->conf->freq_list);
    }

    scan_params = &params;

scan:
    if (ssid || !wpa_s->first_sched_scan) {
        wpa_dbg(wpa_s, MSG_DEBUG,
            "Starting sched scan: interval %d timeout %d",
            wpa_s->sched_scan_interval, wpa_s->sched_scan_timeout);
    } else {
        wpa_dbg(wpa_s, MSG_DEBUG,
            "Starting sched scan: interval %d (no timeout)",
            wpa_s->sched_scan_interval);
    }

    wpa_setband_scan_freqs(wpa_s, scan_params);

    if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_SCHED_SCAN) {
        params.mac_addr_rand = 1;
        if (wpa_s->mac_addr_sched_scan) {
            params.mac_addr = wpa_s->mac_addr_sched_scan;
            params.mac_addr_mask = wpa_s->mac_addr_sched_scan +
                ETH_ALEN;
        }
    }

    ret = wpa_supplicant_start_sched_scan(wpa_s, scan_params,
                          wpa_s->sched_scan_interval);
    wpabuf_free(extra_ie);
    os_free(params.filter_ssids);
    if (ret) {
        wpa_msg(wpa_s, MSG_WARNING, "Failed to initiate sched scan");
        if (prev_state != wpa_s->wpa_state)
            wpa_supplicant_set_state(wpa_s, prev_state);
        return ret;
    }

    /* If we have more SSIDs to scan, add a timeout so we scan them too */
    if (ssid || !wpa_s->first_sched_scan) {
        wpa_s->sched_scan_timed_out = 0;
        eloop_register_timeout(wpa_s->sched_scan_timeout, 0,
                       wpa_supplicant_sched_scan_timeout,
                       wpa_s, NULL);
        wpa_s->first_sched_scan = 0;
        wpa_s->sched_scan_timeout /= 2;
        wpa_s->sched_scan_interval *= 2;
        if (wpa_s->sched_scan_timeout < wpa_s->sched_scan_interval) {
            wpa_s->sched_scan_interval = 10;
            wpa_s->sched_scan_timeout = max_sched_scan_ssids * 2;
        }
    }

    /* If there is no more ssids, start next time from the beginning */
    if (!ssid)
        wpa_s->prev_sched_ssid = NULL;

    return 0;
}


/**
 * wpa_supplicant_cancel_scan - Cancel a scheduled scan request
 * @wpa_s: Pointer to wpa_supplicant data
 *
 * This function is used to cancel a scan request scheduled with
 * wpa_supplicant_req_scan().
 */
void wpa_supplicant_cancel_scan(struct wpa_supplicant *wpa_s)
{
    os_printf("Cancelling scan request\r\n");
    eloop_cancel_timeout(wpa_supplicant_scan, wpa_s, NULL);
}


/**
 * wpa_supplicant_cancel_delayed_sched_scan - Stop a delayed scheduled scan
 * @wpa_s: Pointer to wpa_supplicant data
 *
 * This function is used to stop a delayed scheduled scan.
 */
void wpa_supplicant_cancel_delayed_sched_scan(struct wpa_supplicant *wpa_s)
{
    if (!wpa_s->sched_scan_supported)
        return;

    wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling delayed sched scan");
    eloop_cancel_timeout(wpa_supplicant_delayed_sched_scan_timeout,
                 wpa_s, NULL);
}


/**
 * wpa_supplicant_cancel_sched_scan - Stop running scheduled scans
 * @wpa_s: Pointer to wpa_supplicant data
 *
 * This function is used to stop a periodic scheduled scan.
 */
void wpa_supplicant_cancel_sched_scan(struct wpa_supplicant *wpa_s)
{
    if (!wpa_s->sched_scanning)
        return;

    wpa_dbg(wpa_s, MSG_DEBUG, "Cancelling sched scan");
    eloop_cancel_timeout(wpa_supplicant_sched_scan_timeout, wpa_s, NULL);
    wpa_supplicant_stop_sched_scan(wpa_s);
}


/**
 * wpa_supplicant_notify_scanning - Indicate possible scan state change
 * @wpa_s: Pointer to wpa_supplicant data
 * @scanning: Whether scanning is currently in progress
 *
 * This function is to generate scanning notifycations. It is called whenever
 * there may have been a change in scanning (scan started, completed, stopped).
 * wpas_notify_scanning() is called whenever the scanning state changed from the
 * previously notified state.
 */
void wpa_supplicant_notify_scanning(struct wpa_supplicant *wpa_s,
                    int scanning)
{
    if (wpa_s->scanning != scanning) {
        wpa_s->scanning = scanning;
        wpas_notify_scanning(wpa_s);
    }
}


static int wpa_scan_get_max_rate(const struct wpa_scan_res *res)
{
    int rate = 0;
    const u8 *ie;
    int i;

    ie = wpa_scan_get_ie(res, WLAN_EID_SUPP_RATES);
    for (i = 0; ie && i < ie[1]; i++) {
        if ((ie[i + 2] & 0x7f) > rate)
            rate = ie[i + 2] & 0x7f;
    }

    ie = wpa_scan_get_ie(res, WLAN_EID_EXT_SUPP_RATES);
    for (i = 0; ie && i < ie[1]; i++) {
        if ((ie[i + 2] & 0x7f) > rate)
            rate = ie[i + 2] & 0x7f;
    }

    return rate;
}


/**
 * wpa_scan_get_ie - Fetch a specified information element from a scan result
 * @res: Scan result entry
 * @ie: Information element identitifier (WLAN_EID_*)
 * Returns: Pointer to the information element (id field) or %NULL if not found
 *
 * This function returns the first matching information element in the scan
 * result.
 */
const u8 * wpa_scan_get_ie(const struct wpa_scan_res *res, u8 ie)
{
    const u8 *end, *pos;

    pos = (const u8 *) (res + 1);
    end = pos + res->ie_len;

    while (pos + 1 < end) {
        if (pos + 2 + pos[1] > end)
            break;
        if (pos[0] == ie)
            return pos;
        pos += 2 + pos[1];
    }

    return NULL;
}


/**
 * wpa_scan_get_vendor_ie - Fetch vendor information element from a scan result
 * @res: Scan result entry
 * @vendor_type: Vendor type (four octets starting the IE payload)
 * Returns: Pointer to the information element (id field) or %NULL if not found
 *
 * This function returns the first matching information element in the scan
 * result.
 */
const u8 * wpa_scan_get_vendor_ie(const struct wpa_scan_res *res,
                  u32 vendor_type)
{
    const u8 *end, *pos;

    pos = (const u8 *) (res + 1);
    end = pos + res->ie_len;

    while (pos + 1 < end) {
        if (pos + 2 + pos[1] > end)
            break;
        if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
            vendor_type == WPA_GET_BE32(&pos[2]))
            return pos;
        pos += 2 + pos[1];
    }

    return NULL;
}


/**
 * wpa_scan_get_vendor_ie_beacon - Fetch vendor information from a scan result
 * @res: Scan result entry
 * @vendor_type: Vendor type (four octets starting the IE payload)
 * Returns: Pointer to the information element (id field) or %NULL if not found
 *
 * This function returns the first matching information element in the scan
 * result.
 *
 * This function is like wpa_scan_get_vendor_ie(), but uses IE buffer only
 * from Beacon frames instead of either Beacon or Probe Response frames.
 */
const u8 * wpa_scan_get_vendor_ie_beacon(const struct wpa_scan_res *res,
                     u32 vendor_type)
{
    const u8 *end, *pos;

    if (res->beacon_ie_len == 0)
        return NULL;

    pos = (const u8 *) (res + 1);
    pos += res->ie_len;
    end = pos + res->beacon_ie_len;

    while (pos + 1 < end) {
        if (pos + 2 + pos[1] > end)
            break;
        if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
            vendor_type == WPA_GET_BE32(&pos[2]))
            return pos;
        pos += 2 + pos[1];
    }

    return NULL;
}


/**
 * wpa_scan_get_vendor_ie_multi - Fetch vendor IE data from a scan result
 * @res: Scan result entry
 * @vendor_type: Vendor type (four octets starting the IE payload)
 * Returns: Pointer to the information element payload or %NULL if not found
 *
 * This function returns concatenated payload of possibly fragmented vendor
 * specific information elements in the scan result. The caller is responsible
 * for freeing the returned buffer.
 */
struct wpabuf * wpa_scan_get_vendor_ie_multi(const struct wpa_scan_res *res,
                         u32 vendor_type)
{
    struct wpabuf *buf;
    const u8 *end, *pos;

    buf = wpabuf_alloc(res->ie_len);
    if (buf == NULL)
        return NULL;

    pos = (const u8 *) (res + 1);
    end = pos + res->ie_len;

    while (pos + 1 < end) {
        if (pos + 2 + pos[1] > end)
            break;
        if (pos[0] == WLAN_EID_VENDOR_SPECIFIC && pos[1] >= 4 &&
            vendor_type == WPA_GET_BE32(&pos[2]))
            wpabuf_put_data(buf, pos + 2 + 4, pos[1] - 4);
        pos += 2 + pos[1];
    }

    if (wpabuf_len(buf) == 0) {
        wpabuf_free(buf);
        buf = NULL;
    }

    return buf;
}


/*
 * Channels with a great SNR can operate at full rate. What is a great SNR?
 * This doc https://supportforums.cisco.com/docs/DOC-12954 says, "the general
 * rule of thumb is that any SNR above 20 is good." This one
 * http://www.cisco.com/en/US/tech/tk722/tk809/technologies_q_and_a_item09186a00805e9a96.shtml#qa23
 * recommends 25 as a minimum SNR for 54 Mbps data rate. 30 is chosen here as a
 * conservative value.
 */
#define GREAT_SNR 30

#define IS_5GHZ(n) (n > 4000)

/* Compare function for sorting scan results. Return >0 if @b is considered
 * better. */
static int wpa_scan_result_compar(const void *a, const void *b)
{
    struct wpa_scan_res **_wa = (void *) a;
    struct wpa_scan_res **_wb = (void *) b;
    struct wpa_scan_res *wa = *_wa;
    struct wpa_scan_res *wb = *_wb;
    int wpa_a, wpa_b;
    int snr_a, snr_b, snr_a_full, snr_b_full;

    /* WPA/WPA2 support preferred */
    wpa_a = wpa_scan_get_vendor_ie(wa, WPA_IE_VENDOR_TYPE) != NULL ||
        wpa_scan_get_ie(wa, WLAN_EID_RSN) != NULL;
    wpa_b = wpa_scan_get_vendor_ie(wb, WPA_IE_VENDOR_TYPE) != NULL ||
        wpa_scan_get_ie(wb, WLAN_EID_RSN) != NULL;

    if (wpa_b && !wpa_a)
        return 1;
    if (!wpa_b && wpa_a)
        return -1;

    /* privacy support preferred */
    if ((wa->caps & IEEE80211_CAP_PRIVACY) == 0 &&
        (wb->caps & IEEE80211_CAP_PRIVACY))
        return 1;
    if ((wa->caps & IEEE80211_CAP_PRIVACY) &&
        (wb->caps & IEEE80211_CAP_PRIVACY) == 0)
        return -1;

    if (wa->flags & wb->flags & WPA_SCAN_LEVEL_DBM) {
        snr_a_full = wa->snr;
        snr_a = MIN(wa->snr, GREAT_SNR);
        snr_b_full = wb->snr;
        snr_b = MIN(wb->snr, GREAT_SNR);
    } else {
        /* Level is not in dBm, so we can't calculate
         * SNR. Just use raw level (units unknown). */
        snr_a = snr_a_full = wa->level;
        snr_b = snr_b_full = wb->level;
    }

    /* if SNR is close, decide by max rate or frequency band */
    if ((snr_a && snr_b && abs(snr_b - snr_a) < 5) ||
        (wa->qual && wb->qual && abs(wb->qual - wa->qual) < 10)) {
        if (wa->est_throughput != wb->est_throughput)
            return wb->est_throughput - wa->est_throughput;
        if (IS_5GHZ(wa->freq) ^ IS_5GHZ(wb->freq))
            return IS_5GHZ(wa->freq) ? -1 : 1;
    }

    /* all things being equal, use SNR; if SNRs are
     * identical, use quality values since some drivers may only report
     * that value and leave the signal level zero */
    if (snr_b_full == snr_a_full)
        return wb->qual - wa->qual;
    return snr_b_full - snr_a_full;
#undef MIN
}


#ifdef CONFIG_WPS
/* Compare function for sorting scan results when searching a WPS AP for
 * provisioning. Return >0 if @b is considered better. */
static int wpa_scan_result_wps_compar(const void *a, const void *b)
{
    struct wpa_scan_res **_wa = (void *) a;
    struct wpa_scan_res **_wb = (void *) b;
    struct wpa_scan_res *wa = *_wa;
    struct wpa_scan_res *wb = *_wb;
    int uses_wps_a, uses_wps_b;
    struct wpabuf *wps_a, *wps_b;
    int res;

    /* Optimization - check WPS IE existence before allocated memory and
     * doing full reassembly. */
    uses_wps_a = wpa_scan_get_vendor_ie(wa, WPS_IE_VENDOR_TYPE) != NULL;
    uses_wps_b = wpa_scan_get_vendor_ie(wb, WPS_IE_VENDOR_TYPE) != NULL;
    if (uses_wps_a && !uses_wps_b)
        return -1;
    if (!uses_wps_a && uses_wps_b)
        return 1;

    if (uses_wps_a && uses_wps_b) {
        wps_a = wpa_scan_get_vendor_ie_multi(wa, WPS_IE_VENDOR_TYPE);
        wps_b = wpa_scan_get_vendor_ie_multi(wb, WPS_IE_VENDOR_TYPE);
        res = wps_ap_priority_compar(wps_a, wps_b);
        wpabuf_free(wps_a);
        wpabuf_free(wps_b);
        if (res)
            return res;
    }

    /*
     * Do not use current AP security policy as a sorting criteria during
     * WPS provisioning step since the AP may get reconfigured at the
     * completion of provisioning.
     */

    /* all things being equal, use signal level; if signal levels are
     * identical, use quality values since some drivers may only report
     * that value and leave the signal level zero */
    if (wb->level == wa->level)
        return wb->qual - wa->qual;
    return wb->level - wa->level;
}
#endif /* CONFIG_WPS */


static void dump_scan_res(struct wpa_scan_results *scan_res)
{
#ifndef CONFIG_NO_STDOUT_DEBUG
    size_t i;

    if (scan_res->res == NULL || scan_res->num == 0)
        return;

    wpa_printf(MSG_EXCESSIVE, "Sorted scan results");

    for (i = 0; i < scan_res->num; i++) {
        struct wpa_scan_res *r = scan_res->res[i];
        u8 *pos;
        if (r->flags & WPA_SCAN_LEVEL_DBM) {
            int noise_valid = !(r->flags & WPA_SCAN_NOISE_INVALID);

            wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
                   "noise=%d%s level=%d snr=%d%s flags=0x%x age=%u est=%u",
                   MAC2STR(r->bssid), r->freq, r->qual,
                   r->noise, noise_valid ? "" : "~", r->level,
                   r->snr, r->snr >= GREAT_SNR ? "*" : "",
                   r->flags,
                   r->age, r->est_throughput);
        } else {
            wpa_printf(MSG_EXCESSIVE, MACSTR " freq=%d qual=%d "
                   "noise=%d level=%d flags=0x%x age=%u est=%u",
                   MAC2STR(r->bssid), r->freq, r->qual,
                   r->noise, r->level, r->flags, r->age,
                   r->est_throughput);
        }
        pos = (u8 *) (r + 1);
        if (r->ie_len)
            wpa_hexdump(MSG_EXCESSIVE, "IEs", pos, r->ie_len);
        pos += r->ie_len;
        if (r->beacon_ie_len)
            wpa_hexdump(MSG_EXCESSIVE, "Beacon IEs",
                    pos, r->beacon_ie_len);
    }
#endif /* CONFIG_NO_STDOUT_DEBUG */
}


/**
 * wpa_supplicant_filter_bssid_match - Is the specified BSSID allowed
 * @wpa_s: Pointer to wpa_supplicant data
 * @bssid: BSSID to check
 * Returns: 0 if the BSSID is filtered or 1 if not
 *
 * This function is used to filter out specific BSSIDs from scan reslts mainly
 * for testing purposes (SET bssid_filter ctrl_iface command).
 */
int wpa_supplicant_filter_bssid_match(struct wpa_supplicant *wpa_s,
                      const u8 *bssid)
{
    size_t i;

    if (wpa_s->bssid_filter == NULL)
        return 1;

    for (i = 0; i < wpa_s->bssid_filter_count; i++) {
        if (os_memcmp(wpa_s->bssid_filter + i * ETH_ALEN, bssid,
                  ETH_ALEN) == 0)
            return 1;
    }

    return 0;
}


static void filter_scan_res(struct wpa_supplicant *wpa_s,
                struct wpa_scan_results *res)
{
    size_t i, j;

    if (wpa_s->bssid_filter == NULL)
        return;

    for (i = 0, j = 0; i < res->num; i++) {
        if (wpa_supplicant_filter_bssid_match(wpa_s,
                              res->res[i]->bssid)) {
            res->res[j++] = res->res[i];
        } else {
            os_free(res->res[i]);
            res->res[i] = NULL;
        }
    }

    if (res->num != j) {
        wpa_printf(MSG_DEBUG, "Filtered out %d scan results",
               (int) (res->num - j));
        res->num = j;
    }
}


/*
 * Noise floor values to use when we have signal strength
 * measurements, but no noise floor measurments. These values were
 * measured in an office environment with many APs.
 */
#define DEFAULT_NOISE_FLOOR_2GHZ (-89)
#define DEFAULT_NOISE_FLOOR_5GHZ (-92)

static void scan_snr(struct wpa_scan_res *res)
{
    if (res->flags & WPA_SCAN_NOISE_INVALID) {
        res->noise = IS_5GHZ(res->freq) ?
            DEFAULT_NOISE_FLOOR_5GHZ :
            DEFAULT_NOISE_FLOOR_2GHZ;
    }

    if (res->flags & WPA_SCAN_LEVEL_DBM) {
        res->snr = res->level - res->noise;
    } else {
        /* Level is not in dBm, so we can't calculate
         * SNR. Just use raw level (units unknown). */
        res->snr = res->level;
    }
}


static unsigned int max_ht20_rate(int snr)
{
    if (snr < 6)
        return 6500; /* HT20 MCS0 */
    if (snr < 8)
        return 13000; /* HT20 MCS1 */
    if (snr < 13)
        return 19500; /* HT20 MCS2 */
    if (snr < 17)
        return 26000; /* HT20 MCS3 */
    if (snr < 20)
        return 39000; /* HT20 MCS4 */
    if (snr < 23)
        return 52000; /* HT20 MCS5 */
    if (snr < 24)
        return 58500; /* HT20 MCS6 */
    return 65000; /* HT20 MCS7 */
}


static unsigned int max_ht40_rate(int snr)
{
    if (snr < 3)
        return 13500; /* HT40 MCS0 */
    if (snr < 6)
        return 27000; /* HT40 MCS1 */
    if (snr < 10)
        return 40500; /* HT40 MCS2 */
    if (snr < 15)
        return 54000; /* HT40 MCS3 */
    if (snr < 17)
        return 81000; /* HT40 MCS4 */
    if (snr < 22)
        return 108000; /* HT40 MCS5 */
    if (snr < 24)
        return 121500; /* HT40 MCS6 */
    return 135000; /* HT40 MCS7 */
}


static unsigned int max_vht80_rate(int snr)
{
    if (snr < 1)
        return 0;
    if (snr < 2)
        return 29300; /* VHT80 MCS0 */
    if (snr < 5)
        return 58500; /* VHT80 MCS1 */
    if (snr < 9)
        return 87800; /* VHT80 MCS2 */
    if (snr < 11)
        return 117000; /* VHT80 MCS3 */
    if (snr < 15)
        return 175500; /* VHT80 MCS4 */
    if (snr < 16)
        return 234000; /* VHT80 MCS5 */
    if (snr < 18)
        return 263300; /* VHT80 MCS6 */
    if (snr < 20)
        return 292500; /* VHT80 MCS7 */
    if (snr < 22)
        return 351000; /* VHT80 MCS8 */
    return 390000; /* VHT80 MCS9 */
}


static void scan_est_throughput(struct wpa_supplicant *wpa_s,
                struct wpa_scan_res *res)
{
    enum local_hw_capab capab = wpa_s->hw_capab;
    int rate; /* max legacy rate in 500 kb/s units */
    const u8 *ie;
    unsigned int est, tmp;
    int snr = res->snr;

    if (res->est_throughput)
        return;

    /* Get maximum legacy rate */
    rate = wpa_scan_get_max_rate(res);

    /* Limit based on estimated SNR */
    if (rate > 1 * 2 && snr < 1)
        rate = 1 * 2;
    else if (rate > 2 * 2 && snr < 4)
        rate = 2 * 2;
    else if (rate > 6 * 2 && snr < 5)
        rate = 6 * 2;
    else if (rate > 9 * 2 && snr < 6)
        rate = 9 * 2;
    else if (rate > 12 * 2 && snr < 7)
        rate = 12 * 2;
    else if (rate > 18 * 2 && snr < 10)
        rate = 18 * 2;
    else if (rate > 24 * 2 && snr < 11)
        rate = 24 * 2;
    else if (rate > 36 * 2 && snr < 15)
        rate = 36 * 2;
    else if (rate > 48 * 2 && snr < 19)
        rate = 48 * 2;
    else if (rate > 54 * 2 && snr < 21)
        rate = 54 * 2;
    est = rate * 500;

    if (capab == CAPAB_HT || capab == CAPAB_HT40 || capab == CAPAB_VHT) {
        ie = wpa_scan_get_ie(res, WLAN_EID_HT_CAP);
        if (ie) {
            tmp = max_ht20_rate(snr);
            if (tmp > est)
                est = tmp;
        }
    }

    if (capab == CAPAB_HT40 || capab == CAPAB_VHT) {
        ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
        if (ie && ie[1] >= 2 &&
            (ie[3] & HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
            tmp = max_ht40_rate(snr);
            if (tmp > est)
                est = tmp;
        }
    }

    if (capab == CAPAB_VHT) {
        /* Use +1 to assume VHT is always faster than HT */
        ie = wpa_scan_get_ie(res, WLAN_EID_VHT_CAP);
        if (ie) {
            tmp = max_ht20_rate(snr) + 1;
            if (tmp > est)
                est = tmp;

            ie = wpa_scan_get_ie(res, WLAN_EID_HT_OPERATION);
            if (ie && ie[1] >= 2 &&
                (ie[3] &
                 HT_INFO_HT_PARAM_SECONDARY_CHNL_OFF_MASK)) {
                tmp = max_ht40_rate(snr) + 1;
                if (tmp > est)
                    est = tmp;
            }

            ie = wpa_scan_get_ie(res, WLAN_EID_VHT_OPERATION);
            if (ie && ie[1] >= 1 &&
                (ie[2] & VHT_OPMODE_CHANNEL_WIDTH_MASK)) {
                tmp = max_vht80_rate(snr) + 1;
                if (tmp > est)
                    est = tmp;
            }
        }
    }

    /* TODO: channel utilization and AP load (e.g., from AP Beacon) */

    res->est_throughput = est;
}


/**
 * wpa_supplicant_get_scan_results - Get scan results
 * @wpa_s: Pointer to wpa_supplicant data
 * @info: Information about what was scanned or %NULL if not available
 * @new_scan: Whether a new scan was performed
 * Returns: Scan results, %NULL on failure
 *
 * This function request the current scan results from the driver and updates
 * the local BSS list wpa_s->bss. The caller is responsible for freeing the
 * results with wpa_scan_results_free().
 */
struct wpa_scan_results *
wpa_supplicant_get_scan_results(struct wpa_supplicant *wpa_s,
                struct scan_info *info, int new_scan)
{
    struct wpa_scan_results *scan_res;
    size_t i;
    int (*compar)(const void *, const void *) = wpa_scan_result_compar;

    scan_res = wpa_drv_get_scan_results2(wpa_s);
    if (scan_res == NULL) {
        wpa_dbg(wpa_s, MSG_DEBUG, "Failed to get scan results");
        return NULL;
    }
    if (scan_res->fetch_time.sec == 0) {
        /*
         * Make sure we have a valid timestamp if the driver wrapper
         * does not set this.
         */
        os_get_reltime(&scan_res->fetch_time);
    }
    filter_scan_res(wpa_s, scan_res);

    for (i = 0; i < scan_res->num; i++) {
        struct wpa_scan_res *scan_res_item = scan_res->res[i];

        scan_snr(scan_res_item);
        scan_est_throughput(wpa_s, scan_res_item);
    }

#ifdef CONFIG_WPS
    if (wpas_wps_searching(wpa_s)) {
        wpa_dbg(wpa_s, MSG_DEBUG, "WPS: Order scan results with WPS "
            "provisioning rules");
        compar = wpa_scan_result_wps_compar;
    }
#endif /* CONFIG_WPS */

    qsort(scan_res->res, scan_res->num, sizeof(struct wpa_scan_res *),
          compar);
    dump_scan_res(scan_res);

    wpa_bss_update_start(wpa_s);
    for (i = 0; i < scan_res->num; i++)
        wpa_bss_update_scan_res(wpa_s, scan_res->res[i],
                    &scan_res->fetch_time);
    wpa_bss_update_end(wpa_s, info, new_scan);

    return scan_res;
}


/**
 * wpa_supplicant_update_scan_results - Update scan results from the driver
 * @wpa_s: Pointer to wpa_supplicant data
 * Returns: 0 on success, -1 on failure
 *
 * This function updates the BSS table within wpa_supplicant based on the
 * currently available scan results from the driver without requesting a new
 * scan. This is used in cases where the driver indicates an association
 * (including roaming within ESS) and wpa_supplicant does not yet have the
 * needed information to complete the connection (e.g., to perform validation
 * steps in 4-way handshake).
 */
int wpa_supplicant_update_scan_results(struct wpa_supplicant *wpa_s)
{
    struct wpa_scan_results *scan_res;
    scan_res = wpa_supplicant_get_scan_results(wpa_s, NULL, 0);
    if (scan_res == NULL)
        return -1;
    wpa_scan_results_free(scan_res);

    return 0;
}


/**
 * scan_only_handler - Reports scan results
 */
void scan_only_handler(struct wpa_supplicant *wpa_s,
               struct wpa_scan_results *scan_res)
{
    wpa_dbg(wpa_s, MSG_DEBUG, "Scan-only results received");
    if (wpa_s->last_scan_req == MANUAL_SCAN_REQ &&
        wpa_s->manual_scan_use_id && wpa_s->own_scan_running) {
        wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS "id=%u",
                 wpa_s->manual_scan_id);
        wpa_s->manual_scan_use_id = 0;
    } else {
        wpa_msg_ctrl(wpa_s, MSG_INFO, WPA_EVENT_SCAN_RESULTS);
    }
    wpas_notify_scan_results(wpa_s);
    wpas_notify_scan_done(wpa_s, 1);
    if (wpa_s->scan_work) {
        struct wpa_radio_work *work = wpa_s->scan_work;
        wpa_s->scan_work = NULL;
        radio_work_done(work);
    }
}

int wpas_scan_scheduled(struct wpa_supplicant *wpa_s)
{
    return eloop_is_timeout_registered(wpa_supplicant_scan, wpa_s, NULL);
}


struct wpa_driver_scan_params *
wpa_scan_clone_params(const struct wpa_driver_scan_params *src)
{
    struct wpa_driver_scan_params *params;
    size_t i;
    u8 *n;

    params = os_zalloc(sizeof(*params));
    if (params == NULL)
        return NULL;

    for (i = 0; i < src->num_ssids; i++) {
        if (src->ssids[i].ssid) {
            n = os_malloc(src->ssids[i].ssid_len);
            if (n == NULL)
                goto failed;
            os_memcpy(n, src->ssids[i].ssid,
                  src->ssids[i].ssid_len);
            params->ssids[i].ssid = n;
            params->ssids[i].ssid_len = src->ssids[i].ssid_len;
        }
    }
    params->num_ssids = src->num_ssids;

    if (src->extra_ies) {
        n = os_malloc(src->extra_ies_len);
        if (n == NULL)
            goto failed;
        os_memcpy(n, src->extra_ies, src->extra_ies_len);
        params->extra_ies = n;
        params->extra_ies_len = src->extra_ies_len;
    }

    if (src->freqs) {
        int len = int_array_len(src->freqs);
        params->freqs = os_malloc((len + 1) * sizeof(int));
        if (params->freqs == NULL)
            goto failed;
        os_memcpy(params->freqs, src->freqs, (len + 1) * sizeof(int));
    }

    if (src->filter_ssids) {
        params->filter_ssids = os_malloc(sizeof(*params->filter_ssids) *
                         src->num_filter_ssids);
        if (params->filter_ssids == NULL)
            goto failed;
        os_memcpy(params->filter_ssids, src->filter_ssids,
              sizeof(*params->filter_ssids) *
              src->num_filter_ssids);
        params->num_filter_ssids = src->num_filter_ssids;
    }

    params->filter_rssi = src->filter_rssi;
    params->p2p_probe = src->p2p_probe;
    params->only_new_results = src->only_new_results;
    params->low_priority = src->low_priority;

    if (src->mac_addr_rand) {
        params->mac_addr_rand = src->mac_addr_rand;

        if (src->mac_addr && src->mac_addr_mask) {
            u8 *mac_addr;

            mac_addr = os_malloc(2 * ETH_ALEN);
            if (!mac_addr)
                goto failed;

            os_memcpy(mac_addr, src->mac_addr, ETH_ALEN);
            os_memcpy(mac_addr + ETH_ALEN, src->mac_addr_mask,
                  ETH_ALEN);
            params->mac_addr = mac_addr;
            params->mac_addr_mask = mac_addr + ETH_ALEN;
        }
    }
    return params;

failed:
    wpa_scan_free_params(params);
    return NULL;
}


void wpa_scan_free_params(struct wpa_driver_scan_params *params)
{
    size_t i;

    if (params == NULL)
        return;

    for (i = 0; i < params->num_ssids; i++)
        os_free((u8 *) params->ssids[i].ssid);
    os_free((u8 *) params->extra_ies);
    os_free(params->freqs);
    os_free(params->filter_ssids);

    /*
     * Note: params->mac_addr_mask points to same memory allocation and
     * must not be freed separately.
     */
    os_free((u8 *) params->mac_addr);

    os_free(params);
}


int wpas_start_pno(struct wpa_supplicant *wpa_s)
{
    int ret, interval, prio;
    size_t i, num_ssid, num_match_ssid;
    struct wpa_ssid *ssid;
    struct wpa_driver_scan_params params;

    if (!wpa_s->sched_scan_supported)
        return -1;

    if (wpa_s->pno || wpa_s->pno_sched_pending)
        return 0;

    if ((wpa_s->wpa_state > WPA_SCANNING) &&
        (wpa_s->wpa_state <= WPA_COMPLETED)) {
        wpa_printf(MSG_ERROR, "PNO: In assoc process");
        return -ERRAGAIN;
    }

    if (wpa_s->wpa_state == WPA_SCANNING) {
        wpa_supplicant_cancel_scan(wpa_s);
        if (wpa_s->sched_scanning) {
            wpa_printf(MSG_DEBUG, "Schedule PNO on completion of "
                   "ongoing sched scan");
            wpa_supplicant_cancel_sched_scan(wpa_s);
            wpa_s->pno_sched_pending = 1;
            return 0;
        }
    }

    os_memset(&params, 0, sizeof(params));

    num_ssid = num_match_ssid = 0;
    ssid = wpa_s->conf->ssid;
    while (ssid) {
        if (!wpas_network_disabled(wpa_s, ssid)) {
            num_match_ssid++;
            if (ssid->scan_ssid)
                num_ssid++;
        }
        ssid = ssid->next;
    }

    if (num_match_ssid == 0) {
        wpa_printf(MSG_DEBUG, "PNO: No configured SSIDs");
        return -1;
    }

    if (num_match_ssid > num_ssid) {
        params.num_ssids++; /* wildcard */
        num_ssid++;
    }

    if (num_ssid > WPAS_MAX_SCAN_SSIDS) {
        wpa_printf(MSG_DEBUG, "PNO: Use only the first %u SSIDs from "
               "%u", WPAS_MAX_SCAN_SSIDS, (unsigned int) num_ssid);
        num_ssid = WPAS_MAX_SCAN_SSIDS;
    }

    if (num_match_ssid > wpa_s->max_match_sets) {
        num_match_ssid = wpa_s->max_match_sets;
        wpa_dbg(wpa_s, MSG_DEBUG, "PNO: Too many SSIDs to match");
    }
    params.filter_ssids = os_calloc(num_match_ssid,
                    sizeof(struct wpa_driver_scan_filter));
    if (params.filter_ssids == NULL)
        return -1;

    i = 0;
    prio = 0;
    ssid = wpa_s->conf->pssid[prio];
    while (ssid) {
        if (!wpas_network_disabled(wpa_s, ssid)) {
            if (ssid->scan_ssid && params.num_ssids < num_ssid) {
                params.ssids[params.num_ssids].ssid =
                    ssid->ssid;
                params.ssids[params.num_ssids].ssid_len =
                     ssid->ssid_len;
                params.num_ssids++;
            }
            os_memcpy(params.filter_ssids[i].ssid, ssid->ssid,
                  ssid->ssid_len);
            params.filter_ssids[i].ssid_len = ssid->ssid_len;
            params.num_filter_ssids++;
            i++;
            if (i == num_match_ssid)
                break;
        }
        if (ssid->pnext)
            ssid = ssid->pnext;
        else if (prio + 1 == wpa_s->conf->num_prio)
            break;
        else
            ssid = wpa_s->conf->pssid[++prio];
    }

    if (wpa_s->conf->filter_rssi)
        params.filter_rssi = wpa_s->conf->filter_rssi;

    interval = wpa_s->conf->sched_scan_interval ?
        wpa_s->conf->sched_scan_interval : 10;

    if (params.freqs == NULL && wpa_s->manual_sched_scan_freqs) {
        wpa_dbg(wpa_s, MSG_DEBUG, "Limit sched scan to specified channels");
        params.freqs = wpa_s->manual_sched_scan_freqs;
    }

    if (wpa_s->mac_addr_rand_enable & MAC_ADDR_RAND_PNO) {
        params.mac_addr_rand = 1;
        if (wpa_s->mac_addr_pno) {
            params.mac_addr = wpa_s->mac_addr_pno;
            params.mac_addr_mask = wpa_s->mac_addr_pno + ETH_ALEN;
        }
    }

    ret = wpa_supplicant_start_sched_scan(wpa_s, &params, interval);
    os_free(params.filter_ssids);
    if (ret == 0)
        wpa_s->pno = 1;
    else
        wpa_msg(wpa_s, MSG_ERROR, "Failed to schedule PNO");
    return ret;
}


int wpas_stop_pno(struct wpa_supplicant *wpa_s)
{
    int ret = 0;

    if (!wpa_s->pno)
        return 0;

    ret = wpa_supplicant_stop_sched_scan(wpa_s);

    wpa_s->pno = 0;
    wpa_s->pno_sched_pending = 0;

    if (wpa_s->wpa_state == WPA_SCANNING)
        wpa_supplicant_req_scan(wpa_s, 0, 0);

    return ret;
}


void wpas_mac_addr_rand_scan_clear(struct wpa_supplicant *wpa_s,
                    unsigned int type)
{
    type &= MAC_ADDR_RAND_ALL;
    wpa_s->mac_addr_rand_enable &= ~type;

    if (type & MAC_ADDR_RAND_SCAN) {
        os_free(wpa_s->mac_addr_scan);
        wpa_s->mac_addr_scan = NULL;
    }

    if (type & MAC_ADDR_RAND_SCHED_SCAN) {
        os_free(wpa_s->mac_addr_sched_scan);
        wpa_s->mac_addr_sched_scan = NULL;
    }

    if (type & MAC_ADDR_RAND_PNO) {
        os_free(wpa_s->mac_addr_pno);
        wpa_s->mac_addr_pno = NULL;
    }
}


int wpas_mac_addr_rand_scan_set(struct wpa_supplicant *wpa_s,
                unsigned int type, const u8 *addr,
                const u8 *mask)
{
    u8 *tmp = NULL;

    wpas_mac_addr_rand_scan_clear(wpa_s, type);

    if (addr) {
        tmp = os_malloc(2 * ETH_ALEN);
        if (!tmp)
            return -1;
        os_memcpy(tmp, addr, ETH_ALEN);
        os_memcpy(tmp + ETH_ALEN, mask, ETH_ALEN);
    }

    if (type == MAC_ADDR_RAND_SCAN) {
        wpa_s->mac_addr_scan = tmp;
    } else if (type == MAC_ADDR_RAND_SCHED_SCAN) {
        wpa_s->mac_addr_sched_scan = tmp;
    } else if (type == MAC_ADDR_RAND_PNO) {
        wpa_s->mac_addr_pno = tmp;
    } else {
        wpa_printf(MSG_INFO,
               "scan: Invalid MAC randomization type=0x%x",
               type);
        os_free(tmp);
        return -1;
    }

    wpa_s->mac_addr_rand_enable |= type;
    return 0;
}
